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COVID-19 Advisory: WSU Extension is working to keep our communities safe. All Extension programming is being provided virtually, postponed, or canceled. Effective March 16, 2020, WSU Extension county offices and WSU Research & Extension Centers will be closed to the public. We are available via email, phone, and webconference.

Noxious Weeds

Program Contact: Jason Ontjes, Noxious Weed Program Coordinator
(360) 376-3499 •

Got Tansy? Watch the video below to learn how, and why it’s important to control Tansy Ragwort in San Juan County.





PURPOSE: To review and adopt the 2021 San Juan County Noxious Weed List and to discuss noxious weed control priorities and weed law enforcement guidelines for 2021.

WHEN: Friday, February 5th, 2021 from 9:00 AM to 10:00 AM.

WHERE: Online

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Meeting ID: 981 1899 3639
Date & Time: Feb 12, 2021 08:30 AM Pacific Time (US and Canada)

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The Washington State Noxious Weed Control Board adopted the 2021 Washington State Noxious Weed List on November 10, 2020, adding a new Class A species, Turkish thistle (Carduus cinereus), which was recently found close to Washington in northeastern Oregon and adjacent Idaho. The State Board also adopted changes to the scientific names of several noxious weed species:

  • Annual bugloss is now Lycopsis arvensis;
  • Japanese knotweed is Fallopia japonica;
  • Bohemian knotweed is Fallopia x bohemica;
  • Ravenna grass is Tripidium ravennae;
  • Scentless mayweed is Tripleurospermum inodorum;
  • White cockle is Silene latifolia;
  • Meadow knapweed is Centaurea x gerstlaueri;
  • Japanese eelgrass is Nanozostera japonica;
  • Himalayan blackberry is Rubus bifrons.

Other changes made by the Washington State Noxious Weed Board, including modifications to WAC 16-750, may be viewed at: (   The state list went into effect on January 1, 2021.

The San Juan County 2021 Noxious Weed List must be adopted by February 28th.

In order for this list to become accepted for San Juan County, it must be approved by the County Noxious Weed Control Board based on public input received at this meeting.  The Weed Board requests the public’s insights about local weed distributions as well as suggestions for the 2022 weed list, closing April 30.

For further information, contact the San Juan County Noxious Weed Control Program at (360) 376-3499 or by e-mail at  A draft copy of the proposed 2021 San Juan County Noxious Weed List is available here: 2021 SJC Noxious Weed List Draft.

Read the 2020 Annual Report!

SJCNWCB FINAL 2020 Annual Report 


Our Mission

The mission of the San Juan County Noxious Weed Program is to focus on education, prevention, technical assistance and control of noxious weeds through voluntary compliance with RCW 17.10 and WAC 16-750. The Program offers:

  • Early Detection and Rapid Response;
  • Educational Materials & Programs;
  • Noxious Weed Identification and Inventories;
  • Site-specific Control Recommendations;
  • Weed Control Assistance to Individuals, Organizations & Agencies;
  • Weed Wrench Loans to San Juan County Residents.

Our Goals

The Goals of the Noxious Weed Board Are:

  • To provide education and outreach services to public and private entities on topics related to invasive plants.
  • To provide education-based enforcement and implementation of state and county noxious weed laws.
  • To work closely with individuals, property owners, businesses, associations and government agencies in noxious weed control efforts.
  • To eradicate all known Class A noxious weeds within the county.
  • To Contain or control the spread of all state-designated or county-selected Class B and C noxious weeds within the county.
  • To prevent the incursion of newly listed or unlisted weeds of concern on to county lands.

Introduction to Noxious Weeds in San Juan County

What’s Happening


Brochures and other literature are available online or through the Weed Control Program at 376-3499.

Related Organizations

Try a Weed Wrench™

to eliminate Scotch Broom!


Need weed wrench instructions or info?

Weed wrenches may be checked out FOR FREE from the following sources:

Orcas – SJC Noxious Weed Board office in Eastsound (8 wrenches) (360) 376-3499

San Juan -WSU Extension-(2 wrenches) (360) 378-4414; SJC Public Works (360) 370-0500; SJC Land Bank (4 wrenches) (360) 378-4402

Lopez– Public Works Office (2 wrenches) (360) 370-0500

Lopez Land Bank -Amanda Wedow


Purchase a Wrench at:

Uprooter (888) 801-0201
or (541) 226-9872
Grants Pass, OR 97528

Poison Hemlock

Poison Hemlock information


How to identify Poison Hemlock vs. other plants. 


Noxious Weed Pamphlets

Information on identification, eradication or control (requires Adobe Acrobat Reader)

Guy wrapped in a weed

San Juan County Extension

221 Weber Way
Friday Harbor, WA 98250

Please contact us if you have any questions or concerns. Thank you!

Orcas Island, Jason Ontjes, NW Program Coordinator- (360)376-3499 or

Friday Harbor, Carlton Burns, NW Field Specialist-